triangle inequality

triangle inequality

noun Mathematics.
1.
the theorem that the absolute value of the sum of two quantities is less than or equal to the sum of the absolute values of the quantities.
2.
the related theorem that the magnitude of the sum of two vectors is less than or equal to the sum of the magnitudes of the vectors.
3.
(for metric spaces) the related theorem that the distance between two points does not exceed the sum of their distances from any third point.

Origin:
1960–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Triangle inequality is always a great word to know.
So is cube root. Does it mean:
a quantity of which a given quantity is the cube
a relation between two sets in which one element of the second set is assigned to each element of the first set, the operator
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